Grinding apparatus



April 18, 1933. H, L. CROWLEY 1,904,274

GRINDING APPARATUS Filed April 9, 1951 Patented Apr. 18, 1933 UNITED STATES PATENT. 4oIfFioi?. vf

HENRY L. CROWLEY, OF' EAST ORANGE, NEW JERSEY, ASSIGNOR To HENRY 1..,cRoWLEY a COMPANY, INC., OR WEST ORANGENEWJERSEY, A CORPORATION OE NEW JERSEY f' GRINDING APRARATUS f Application inea April 9, 1931. seriikNo. 528,729.

This invention relates in general `to ceral mic product of a particular form and Athe apparatus and method for producing the same. One of the objects of this :invention is the provision of a ceramic insulator such as now l used for heating the cathodefor an velectron discharge: device. f

Another ob] I lA further objectpf invelnitionfisthel provision of a ceramic support generally in circular form and flat on one side to facilitate handling during manufacture.

VA still further object of thislnventionL is toV provide the ceramic support with a flattened side with the plane thereof parallel to the plane of the holes throughwhich the insulating wires pass, which holes are offset trans-v A the wires are threaded through the holes a,

versely of the center of the body. A further Ob'l provision ofy an apparatus by mea` ceramicv bodies of this typek may behandled eiiciently and in largenumbers during ythe notching operations. g

A still further object of this invention is the provision ofa machine bymeans of which such ceramic bodies will be rapidlyand efif ciently ground without substantial breakage.

These and many other objects as will appear from the following disclosure are secured by means of this invention. n

This invention resides substantially in the combination, construction, arrangement, relative location of parts, steps and series of steps of the article produced thereby, all as will be described below.

Referring to the drawing: Figs. l and 2 are side and end views of the ceramic support; Figs. 3 and4 are end and top plan views of the apparatus of this invention;

Fig. 5 is an enlarged modified detail view of part of the apparatus.

The ceramic body of this invention may be produced by any known method, as well ect lof this inventionis the j struction of a ceramic 4supportiof thistype 10 which is notched toexpose eheh-eating ele-` ect ofthis inventionis the. ns ofwhichl as bythezmethod of my copending applica-y tion Serial No.332,555 filed January 14, 1929, andbythe method disclosed in my copending applicationSerialNo. 528,732,1led April 9, 1931; Y

The cera'l iic body itself will be4 described.. in detail first since an understanding of its construction makes the method and apparatus employed easily understandable. The ceramic body comprisesa rod'l of substantially circulai-crosssection kwhich is flat on one side as indicated at 2. Extending longitudilnally through thebody are two holes 3 which emerge at both ends thereof. The plane of the center lines of these two'bores is parallel to'the'lattened side 2 and is offset lfrom the axis of the rod in adirection away from the flattened side 2; lAll of' this is clear fromv 2. vWithin the holes 3 isthreaded a hair-.v

pin shape wire t which forms a-cathode or heater. rlhe ceramic body l is notched yatv regular intervals, as shown at 5, so'as to cut through the plane of the holes. Thus, when body is stronger. The-relative'position of the'fiattened side of the rods and theholes permits of a process by means of'which the notches/may be accurately and quickly cut in the proper position as will'ap-pearbelow.

A Vsuitable machine forv cutting fthese.

' notches will now be described.` It isfirst pointed `outthat heretofore these notches havey been `ground into the rods one at a time' by hold-ing them against a gang ofrgrinders';L there being as many grinding wheels as there; are notches to be cut in the rod. Such-a; process. was lfound'tobe slow, tedious and expensive, However, itis noteasy to sup' port these ceramic bodies in chucks orV jigs of` the, usual type, since it was foundv that 24 v j I 1,904,274.

they broke or crushed when gripped under the proper pressure; since they are usually slightly warped or bent, when gripped, in a jig or chuck, they being non-flexible cracked. All these difficulties are overcome by this invention. At 6 is a suitable table or platform on which are secured the fixed parallel guides 7. Within these guides and on the table is slidably supported a plate 8. Secured to this plate by means of the bolts and wing nuts 10 are the L-shaped parallel bars 9. Between these bars and resting on the plate 8 is a thin sheet of suitable soft resilient material, such as a sheet of rubber 11. The upper projecting flanges of the bars 9 are provided on their under surfaces with similar thin strips of sheet rubber 12 which are secured in place in any suitable manner.

o, Supported over these parts in the proper 2 relation is a rotatable shaft 13 upon which are mounted a number of grinding or emery wheels 15, which are held in a separated position by means of the spacers 14. As is clear `fromv the drawings, a number of ceramic bodies 1 are mounted with their flat sides against the rubber sheet 11 and their ends lying' under the rubber strips 12. A number of these are mounted in place, as shown in 36 Fig. 4, and are then gripped by tightening down on the wing nuts 10. With the grinders 15 revolving at the proper speed the jig comprising the parts 8, 9, 10, 11 and 12 is slid along the support 6 between the guide 7, so that one after the other of the rods 7 are presented to the grinders and are notched. The flat sides of the rods permit accurate positioning of the holes or bores 3 in the rods with respect to the grinders, so that thesel :holesor bores will be cut through. The resilient gripping of the rods prevents their breakage and the supporting of a number of them, as shown, permits a rapid grinding. With one machine and a number of jigs, it is possible to handle large numbers of these supports. Workmen can be mounting the rods in the jigs while the machine operator runs them through the grinder.

A slightly modified arrangement isshown i-.in Fig. 5 from which a ceramic body of the Same form as before is mounted on the jig between the fixed bar 23 and the parallel transversely slidable bar 20. Each of these bars is provided with a number of pins 24 projecting towards each Y other as shown. TheseV pins are simple enough to slip into the bores 3. Bar 2() is then slid over to the position as shown in Fig. 4 and slipped in place by means of the wing nuts 22. As before, the flat side of this ceramic lies against the resilient cushion 11.

In good practice this resilient blanket 1l is approximately 1F to 1/8 of an inch thick. This invention is applicable to hard vitreous ceramic bodies, as Well as to the softer bodies such as disclosed in my above mentioned application.

From the foregoing disclosure it will be apparent that my invention involves certain principles of construction and operation which may be embodied in different physical forms and carried out in other ways without departure therefrom. I do not, therefore, desire to be strictly limited to the disclosure as given forV purposesof illustration, but rather to the scope of the appended claims.

It is well to point out here that the principles of this invention may be applied to other shapes of ceramic supporting body. For example, the rod is not necessarily of circular cross-section, but can be square,rec

Vtangular, octagonal and of other cross-sectional shapes. e

What I seek to secure by United States Letters Patent is: Y

1. A jig of the type described comprising a plate, a pair of parallel L-shaped bars releasably secured along the edges of said plate, a resilient cushion on said plate between said bars, and resilient cushions on the flanges of said bars.

2. A grinding machine of the type described comprising ythe combination with a support, guides on said support, a plate slidably mounted on said support between said guides, and resilient means for holding work pieces on said plate, of Vmeans for Vrotatably supporting a. plurality of grinding wheels in spaced relation so as to engage the work pieces when secured to said plate.

3. A jig or chuck holder comprising a plate, a bar secured to saidplate having' a plurality of pinsprojecting therefrom, and a second barslidably secured to said plate and parallel to said first bar having a plurality of pins thereonin alignment with the pins on the first bar. Y

In testimony whereof I have hereunto set my hand on this 6th day of April, A. D. 1931. Y

HENRY L. CROWLEY.

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